Tool holder for nut making apparatus



Aug 30, 1932- s. w. Avls ET AL 1,374,416,

TOOL HOLDER FOR NUT MAKING APPARATUS INVENTO A. W M v M, A 21 BY p mwwmvzwa.

ATTORNEYS Aug. 30, 1932.

s. w. AVIS ET AL TOOL HOLDER FOR NUT MAKING APPARATUS Filed March 19,1950 4 Sheets-Sheet 2 Q3 n NS. 5 ww w wMWw /V I, $3 QUE? INVENTOR Ailfin): v m. 62AM p wmwww ATTORNEYS Aug. 30, 1932. s. w. AVIS ETAL TOOLHOLDER FOR NUT MAKING APPARATUS 4 Sheets-Sheet 3 Filed larch 19, 1930INVENT I llllll| llllllll .u m i ETTNH "f n" J. m.

AMQMYMN ZEM ArroRNEYs Aug. 30, 1932. 5, w; v E AL 1,874,416

' TOOL HOLDER FOR NUT AiAKING APPARATUS Filed larch 19, 1930 4Sheets-Sheet 4 INVENTOR 4w. an Y M. Ma

BY 4 M, bwwmwiwwza ATTORNEYS Patented Aug. 30, 1932 UNIT L TATQ S saMUnLw. we, on humus, conn acrxourr; Anni unicorn i1 amiss; or wamnam,massacnusn'rrs, ASSIGNORS TonnssELninUnnsau. a wean BOLT a NUT comranzorroar cnasma; nawcvoama coaroaarxon or new Yoax e flbmifmen museumsapplication flIeIIarehiB,1930. Serial.No. 4 3 7 ,081.

This invention relates to' apparatus for forming nut blanks. In a'copending application of Samuel W. Avis, serial No. 287,795 filed J une23, 1928,;there is described and claimed a process of makingnut blanksby cold punching in whichg'the volumebfthe blank is substantially equalto thevolurne of the finished nut. The apparatusherein described andclaimed is particularly suitable for use in practicing ,the'Avis-process. i i

In the manufacture of-nut blanks bythe cold punch process now in 'use,the waste or scrap amounts to substantially 50 percentof the material;'As morefu'lly describedin the Avis application, this waste can besubstantially eliminated" by forcing outwardly -'a metal blank ofsubstantially the same volume as the volume ofthe finished nut to formthe central opening of-thenut, and produce a blank of the desired size.To carry out this operation on a commercial scale, it'isnecessary toform the central opening ina series of punchingoperations, andthepresent machine is designed for the purpose of performing this seriesof punching operations simultaneously on a: plurality of blankscarriedby a dial or other suitable supporting'member, said dial having'a stepby step movement, whereby the production of the machine may comparefavorably, with the production of a machine of the prior art 'inwhichthe central opening is formed in a single punching operation. t

We accordingly provide a machine consisting of a dialhaving a pluralityof die pockets, together with means for imparting a step 'by step motionto the dial. 1 A tool holder and stripper block is arranged on each sideof the dial and means are providedfor reciprocating them toa close'dposition and to an open position. The dial driving means is synchronizedwith the reciprocating drive means to movethe dial while the toolholders and stripper blocks are in open position. Thetool'holders areprovided with anumber of punches or other tools'corresponding in numbertothe number of die'pockets in the dial, so that at each closing ofthetool holders, a separate operation may be performed on a nut blank ineach pocketm' Suitable :Fig. 3.

means "are provided for automatically feeding the blanks to the dial atthe first station, thefeeding mechanism being actuatedupon eachm'ovement of the reciprocating parts of the machine to feed one blank;andmean's are provided for ejecting the finished blank from the-dial. Vy

v The machineis alsoprdvided withsuitable safety means for automaticallydisengaging the-dial from the drive 'mech'anl'sm up'on breakage of anyof the punches, or displacement 0f'the blanksfr0m the die pockets totherwith means for returning the dial to its last operating position so thatthe dial pockets Fiwill be iiin alignment with the punches', and injuryto the apparatus will 'be prevented. c i Inthe accompanying drawings wehave shown "one form of the invention. l

In the drawings Figi 1 is aplan view; 1

F g; 2 is a side elevation i V i Fig. 3 is'al vertical, sectional viewon line of Fig. 1 on an enlarged-scale; 1

" Fig. -4,'s aplan viewon the-same scale Fig. 3 with the top castingremoved, a nd with 'partsibroken away for clearness; and i Fig. 5' is avertical, sectional view on-line 5--5 of Figs. 2 and 3 onthe same scaleas Referring to drawings, the reference numeral 1 designates the'lowerportion of the 1 main housing. The upper portion 2 is .arranged over thelower portion of the housing and provided with a cover '3. The machineis driven-bymeans of a motor 4 (see Fig; 1)

arranged at oneendof the niachine'and sup ported on the upper section 2of the housing.

The motor is provided with a-motorshaft- 5.

The motor shaft 5 carries a coupling 6, connected to a stub shaft 7,mounted in a housing 8. V A pinion9 (see Fig. 2) ismounted on this stubshaft and drives an intermediate gear or pinion 10 mounted on anintermediate shaft '11. V The gear 10-Ineshes witha gear 12 mounted onemain drive shaft 13. The drive-shaft 'is provided with a fly wheel 14and with an electric clutch 15 (seeFig 1). A brake-drum band 17controlled by a magnet or solenoid 18. The drive shaft 13 is alsoprovided with a pair of pinions 19 each of which meshes with a gear 20mounted on a crank shaft 21. The crank shaft 21 drives a crank arm 22(see Fig. 3) which is connected to a vertical, reciprocating slide 23.This slide works in upper and lower guide members consisting of castings24 and 25 carried by the'upper and lower castings 2 and 1, respectively.The cas'tings'24 and 25 may be provided with wear plates orfacings 26adapted to be engagedbythe slide. Intermediate its endsthe slide 'isprovided with a rectangular opening for the reception of a pair ofbearing blocks 28. These bearing blocks are adjustableby means of awedge29 having suitable adjusting means 30. Each side-of the slide isprovided with a pair of bearings-31 (see Fig. 4) adapted to receive'apin 33. V Alink 34 is carried by each-of the pins 33. As shown, the linkis provided with an opening adjacent its end for the reception of thepinand a bushing 32 which surrounds the pin. The end of the link is roundedand adapted to be received in a concave recess in the-bearing block 28.7 One of the links 34 is connected to a rear slide 35 which is adaptedto reciprocate on a suitable bed at right angles to the vertical slide23.; The bottom of the slide 35 engages a wear plate 36 and one side ofthe slide engages a portion of the housing. The other side engages awedge-shaped wear plate '37, thus permitting adjustment and alignment ofthe slide. The face of the slide is recessed to receive a bearing block38 having a concave face and the end of the link 34 is rounded to engagethe face of the bearing block. This end of the link is provided with anopeningadapted to receive a bushing 40. A pin 39 extends through thebushing 40 and is received in bearings in the side walls ofthe rearslide 35. The bearing block 38 is also provided with an adjusting wedge41 having suitable adjusting means 42. 'I

The other link 34 is similarly connected to a center slide 43 which isalso recessed as herebefore described for the reception of a bearingblock 44. The bearing'block 44'is adjustable by means of a wedge 45 andwedge adjusting means 46. The bearing block 44 is shaped similar to thebearing'block 38and is also adapted tobe engaged by the rounded end ofthe link 34. The link is also provided with .an opening to receive abushing in whichis mounted a pin-47 which is received in bearings in theside walls of the center slide. By providing the bearing blocks 28, 38and 44 --the thrust of the drive from the vertical slide 23 'to the rearslide 35 and center slide 43 is taken off the pins 33, 40 and 47 andtransmitted through the bearing blocks and'the links to the slides. Thebearing blocks-may be adjusted when necessary, through their respectivewedges to retain the roundedv ends of-the links 34 in contact withtheconcave faces of the bearing blocks so that the thrust is conveyedthrough the bearing blocks to the slides.

A front slide 48 is connected to the rear slide 35 to reciprocatetherewith. The center slide is provided with openings adjacent eachcorner (see Fig. 5) through which pass tie rods 49 and these tie rodsare surrounded by tubes 50. These tubes enter openings in the A frontand rear slides andengage shoulders 51 formed by a reduction in the sizeof the opening. The rods extend through the reduced portion of theopenings as indicated at 52 in Fig. 4 of the drawings and are providedwith nuts 53 on their ends. The front and rear slides are thus tiedtogether by the rods 49 and tubes 50. Before assembling the rods 49 areheated, and they are placed in the tubes and tied together while stillhot. The rods contract on cooling and the housing 58 into a housing 59at the front of the machine. .The lower end of shaft 56 isprovidedwith-abevel gear 60 meshing with a'bevel gear 61 mounted on acam shaft 62. The center slide 43 and the front slide 48 areprovidedwith tool holders 74. The tool .holdersare mounted on the slidesby means of a tongue and groove and. are capable of being adjusted toproperly center them.

- A stripper block 89 is mounted in front of each'of the tool holders.Each of the stripper blocks is provided with a plurality of concentricopenings, preferably four in number, and a supporting stud passesthrough each of these openings and is received in an aligned opening inthe tool holder.

A dial98 is arranged between the pair of stripper blocks (see Fig. 3).

A link 360 may be connected to the bottom of the vertical slide 23 andthis link is connected'to a bell crank lever 361 pivotally V mounted asat 362 in a bracket 363 carried by the lower casting. The other end ofthe bell crank lever is connected to the connecting rod 364 of a piston365 which is mounted in a cylinder 366 arranged on the casting 1. Thecylinder is provided with a plurality of air'ports 367 arranged at adistance from the head of the cylinder so that the outward movement ofthe piston will'trap a body of air in the cylinder and cushion themoveup the unused energy of the upstroke and give it off on the downstroke, thereby adding to the power of the down or working stroke. Thisresults in considerable gain in machine efliciency and higher speed isattained.

On the outward movement of the front slide 48 the nuts 53 on the ends ofthetie rods move to a point beyond the vertical plane of the supportingcasting 126. The casting is provided with openings through whichthe endsof the rods and the nuts pass and these openings are provided with covermembers 371 which are substantially cup-shaped and the bottoms of whichare spaced from the supporting casting 126. These cover plates may besecured in position by bolts 3 2 passing through aligned openings inears 373 of the cover plates into openings in the casting. These coverplates prevent the oil used in lubricating the dial and its associatedparts 7 from entering the housing of the cam shaft 62 and mixing withthe lubricating oil employed in this portion of the machine.

We claim: 7

1. In a nut making machine, a front slide,

a center slide, said slides being reciprocal in independent paths,toolholders carried by said slides, a rear slide connected to said frontslide, a vertical slide arranged between said rear slide and said centerslide and links connecting said rear slide and center slide to saidvertical slide to reciprocate them in opposite directions.

2. In a nut making machine, a front slide, a center slide, said slidesbeing reciprocal in independent fields, tool holders carried by saidslides, a rear slide arranged adjacent said center slide, rodsconnecting said rear slide and said front slide, compression tubessurrounding said rods, 2, vertical slide arranged between said rearslide and said center slide, and links connecting said rear slide andsaid center slide to said vertical slide to reciprocate them in oppositedirections.

In testimony whereof we aflix our signatures.

SAMUEL W. AVIS. MALCOLM AMES.

